Diamond



FIG. 1 is a top plan view of the claimed design;

FIG. 2 is a front elevational view;

FIG. 3 is a rear elevational view;

FIG. 4 is a side elevational view, the opposite side view being a mirrorimage; and,

FIG. 5 is a bottom plan view.

CLAIM The ornamental design for diamond, as shown and described.